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        <a href="http://www.baidu.com" target="_blank">百度一下</a>
        <a href="http://www.qq.com" target="_blank">腾讯一下</a>
        <a href="./02_常用文本标签.html">文本标签</a>
        <a href="mailto:gaolingyu@itcast.cn" target="_blank">给老高发邮件</a>
        <a href="tel:10086" target="_blank">给移动打电话</a
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